Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f8d4086013b899…

MALICIOUS

PDF

35.3 KB Created: 2020-05-13 05:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6fe1457f7d9e6b01d8bc98e66f155ef SHA-1: 2e2b7d9b4dacf2185b37301316b71cb9ab753271 SHA-256: 88f8d4086013b8999cfd0452d7af1743f46825c6e39b40a10187683afc1cb029
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external PDF files across various domains, indicating a link farm or content distribution strategy. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wolfjurgen.com/uploads/1/3/0/9/130969757/130969757.html#attu+movie++hd+single+part
    • http://mrsparsons.net/uploads/1/3/0/7/130775701/kogumorazugiwon.pdf
    • http://mentorkg.org/uploads/1/3/0/3/130379114/kuninofejapiludagiv.pdf
    • http://sundogstills.com/uploads/1/3/1/4/131414358/4610611.pdf
    • http://end-days.com/uploads/1/3/1/3/131379276/fc2e09644552b9.pdf
    • http://blueridgefigureskatingclub.com/uploads/1/3/0/7/130775103/barodidiso-suvare-jafok-mozenetoba.pdf
    • http://stglowblog.com/uploads/1/3/1/3/131379716/pubofo-lulapa.pdf
    • http://networkdua.com/uploads/1/3/1/6/131637686/rebusivizivif_rosadagasediji.pdf
    • http://lifespringholistic.com/uploads/1/3/0/8/130874091/vasowubizip.pdf
    • http://elitesouthernshowcase.com/uploads/1/3/0/6/130639811/gebilugezulur.pdf
    • http://glimmeringmoments.com/uploads/1/3/1/3/131383592/lelodujubemowux_mepovelafaku_zabozidareji.pdf
    • http://kovgusparbs.org/uploads/1/3/0/2/130289288/desepopajo_nijinix_gugaxikitip_towabomipex.pdf
    • http://rodeorvpark.com/uploads/1/3/0/8/130813649/52c8fe56061cf7.pdf
    • http://wholebodyholistics.net/uploads/1/3/0/2/130289577/vutunenigopili-punodaw-xamub.pdf
    • http://frankyabundes.com/uploads/1/3/0/5/130539016/wavunomebalukob.pdf
    • http://coletteliebenberg.com/uploads/1/3/1/4/131406294/fepegizukipaxaw_desojajurizep_xepolejam.pdf
    • http://techcropltda.com/uploads/1/3/0/2/130289242/6626646.pdf
    • http://thejohnaustin.com/uploads/1/3/0/5/130543837/gazobumuled_xisifolima_ligakufu_zewapexijosaj.pdf
    • http://sunfamily.xyz/uploads/1/3/0/5/130551832/fuzivibax.pdf
    • http://mrncrdbl.com/uploads/1/3/0/2/130291390/b3d414c.pdf
    • http://bullyupstander.org/uploads/1/3/0/2/130289292/jobepowitopiwope.pdf
    • http://kipart.org/uploads/1/3/1/8/131858166/fesirevetadu.pdf
    • http://thompsonhomeservicesllc.com/uploads/1/3/0/9/130969681/nirejawupevugug.pdf
    • http://clbusrepairservice.com/uploads/1/3/0/6/130605016/c3be78208ab7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dab.bin
270edc5feaa0128b8873ed86a0932d416a83c5225fba86a1865db0382181d6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAB 10280 bytes

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